Marble game board



FIG. 1 is a top plan view of a marble game board showing my new design with a game board and a plurality of marbles separated for clarity;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side elevation view thereof, the opposite side being a mirror image of the shown;

FIG. 4 is a front elevation view thereof, the opposite side being a mirror image of the shown; and,

FIG. 5 is an isometric view thereof. 

CLAIM The ornamental design for a marble game board, as shown and described. 